Added handler stack management. Closes #5, #6.
Fix test for PHP 5.3.
Trying again for 5.3.
Trying again for 5.3.
Trying again for 5.3.
Trying again for 5.3.
Updated documentation. [ci skip]
Updated documentation. [ci skip]
Updated documentation. [ci skip]
Updated documentation. [ci skip]
Bumping CI.
Bumping CI.